K&N Universal Custom Air Filter - Oval Shape 9.313in OD / 2.375 Height 2015-bmw-m235i-esi8311981 The 1-3/4 inch diameter rubber

The 1-3/4 inch diameter rubber flange is designed to push on and clamp directly on to metal or plastic tubing where venting is needed

Replacement fitting for Radium Engineering Direct Mount Regulators (Gen 2 design)

19” one piece rotors or 12

9 hardware for absolutely zero-slip

and in most cases the ends of each rail are pre tapped to accept -6 AN or 9/16"x18 fittings for users who want to use custom fuel lines

K&N Universal Custom Air Filter - Oval Shape 9.313in OD / 2.375 Height 2015-bmw-m235i-esi8311981 The 1-3/4 inch diameter rubberThe K&N replacement air filter for RK Series air cleaner assemblies is designed to increase horsepower and acceleration while providing excellent filtration. The air filter is washable and reusable and designed to be used as a replacement air filter for specific K&N RK Series air cleaner assemblies for Harley Davidson motorcycles. The air filter is covered by the famous K&N Million Mile Limited Warranty.